Pass the Salesforce Developers PDII Questions and answers with ExamsMirror

To improve the performance of an Aura component that is loading slowly, the developer can make the following change:

D. Change the default for showContactInfo to “False": By setting the default value of showContactInfo to False, the component does not fetch or render the contact information by default, which can reduce the initial load time. The information can be fetched and displayed later based on user action or other triggers.

Changing the type of contactInfo to "Map" (Option A) or moving the contents of <c:contactInfo> into the component (Option B) may not necessarily improve load times. Adding a change event handler for showContactInfo (Option C) adds more processing and can potentially slow down the component if not handled efficiently.

Apex managed sharing is used to programmatically share records when organization-wide defaults are private. It allows for creating share records that give read-only access to users specified in a related list.

Making a callout from an Apex trigger is not allowed synchronously; hence, such callouts must be performed in an asynchronous context. The only way to perform this within the Salesforce platform is by using asynchronous Apex, such as @future methods or Queueable Apex.

Use Apex Managed Sharing with an after insert trigger. It allows dynamic record sharing based on user-defined criteria like the Event_Reviewer_c field.

Test.setCurrentPage(Page.MyTestPage) is used to set the context to a Visualforce page in tests, allowing you to simulate a page request in a test method.

When faced with performance issues in a Lightning Web Component (LWC) due to SOQL query load times, the optimal approach is often to improve the query's selectivity. This can be achieved by using a selective SOQL query with a custom index. Salesforce can create custom indexes to improve the performance of queries that cannot be optimized through standard indexing. When a query is selective, it can efficiently retrieve records from the database using the index, thus reducing the query execution time and speeding up the component's performance when filters are changed. The other options (returning all records, using SOSL, or client-side caching) do not directly address the root cause of the performance issue, which is the need for a more efficient database operation.

Custom metadata types are the optimal way to store secret data that needs to be accessed by certain profiles and users. Access to custom metadata records can be controlled by the Salesforce sharing model.

Jest tests are essential for developing Lightning Web Components (LWC) because they allow developers to ensure the quality and correctness of their components in isolation from the rest of the application. Reason A is incorrect because testing non-public properties breaks encapsulation and is considered bad practice. B is correct because Jest tests can simulate user interactions with the component, such as clicking buttons or entering text, to ensure it behaves as expected. C is correct as well because Jest tests can confirm that the component renders the expected DOM output, which is crucial for ensuring that the HTML structure of the component is accurate. D is not the best choice since Jest is more suited for testing components in isolation rather than how multiple components interact; integration tests are more appropriate for that. Lastly, E is correct because Jest tests can verify that events are fired at the appropriate times, which is a critical part of the component's interaction with the rest of the application.

References

Jest Testing: Lightning Web Components Testing

Jest Testing Best Practices: Lightning Web Components Jest Best Practices

The <apex:actionStatus> tag in Visualforce is used to display the status of an AJAX request, such as showing different text while a command button is processing an action.

Custom Apex REST services are the optimal solution for integrating Salesforce with an external PIM system. When a product is created or updated in the PIM, the external system can make a REST call to a custom Apex REST endpoint in Salesforce, which then can create or update the Product2 and PricebookEntry records. This method allows using custom settings to determine the Pricebook2 dynamically.